Update The Timex WR 50M is part of the 1440 Sports watch set. It was named the 1440 because every day has 1, 440 minutes in it. The Timex WR 50M uses a snap back for the cover plate for the battery. To change the battery you need a precision screwdriver set because there is a very small Phillips screw that Sep 24, 2010 Sportline heart rate watch. Category Comedy; Sportline Duo Heart Rate Monitor Duration: 2: 58. How to replace my lithium battery of my Polar FS1 watch Heart Rate Monitor Duration: Find great deals on eBay for sportline watches.

The Low Battery icon is visible To replace the battery of your Sportline S7, we recommend you take it to a watch repair service center or certified jeweler. This will ensure that the water resistance will be retained after battery replacement. View and Download Sportline DUO 1010 user manual online.